Agnus Dei

A cake of wax or dough stamped with the figure of a lamb
supporting the banner of the Cross, and distributed by the Pope on the
Sunday after Easter as an amulet. Our Lord is called Agnus Dei
(the Lamb of God). There is also a prayer so called, because it begins
with the words, Agnus Dei, qui tollis peccata mundi
(O Lamb of God, that takest away the sins of the world).